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Some consideration on diversifying selection.

F Tajima1, T Mukai

  • 1National Institute of Genetics, Kyushu University, Fukuoka.

Idengaku Zasshi
|August 1, 1990
PubMed
Summary
This summary is machine-generated.

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Diversifying selection can increase genetic variation and mutant frequencies, even without marginal overdominance. However, this process incurs significant genetic load, suggesting its limited role in natural populations.

Area of Science:

  • Population genetics
  • Evolutionary biology
  • Genetics

Background:

  • Genotype-environment interaction drives diversifying selection, potentially increasing genetic variation.
  • Stable genetic polymorphism and marginal overdominance conditions are often restrictive in these models.

Purpose of the Study:

  • To examine a simple model of diversifying selection.
  • To understand its impact on mutant frequencies and genetic load.
  • To assess the conditions for stable genetic polymorphism.

Main Methods:

  • Analysis of a simple diversifying selection model.
  • Mathematical modeling of genotype-environment interactions.
  • Examination of mutation-selection balance.

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Main Results:

  • Diversifying selection can elevate mutant frequencies beyond simple mutation-selection balance, even without marginal overdominance.
  • This model generates substantial genetic load (environment load) irrespective of marginal overdominance conditions.
  • Low equilibrium frequencies of mutants were observed under these conditions.

Conclusions:

  • Diversifying selection can increase genetic variation and mutant frequencies.
  • Significant genetic load is a consequence of this selection model.
  • The number of loci affected by this type of diversifying selection is likely very small.